In the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly in In, 49 protons, 49 electrons. option A is correct.
The protons contain the maximum mass of any atom or molecule they are present at the nucleus of the atom as the mass is focused at the center only they are positively charged species and greater in mass as compare to electrons.
Electrons are the negatively charged species and they rotate at the given shells or orbits around the nucleus they are negligible in mass as compare to protons but can effect the size of any element.
To specifies the size of an atom the number of protons and electrons of every atom in the periodic table is same.
Therefore, the number of protons, and the number of electrons given correctly in In, 49 protons, 49 electrons. option A is correct.
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